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利用硫酸-硫酸铵混合溶液作为吸收及消解液,开发了直接吸收、消解、显色分析纳米TiO2生产现场空气中的纳米TiO2粉尘的方法。并研究了各类口罩对于纳米TiO2的拦截效率。结果表明,在流速为400L/h,采集时间为2.5 h的情况下,采用两级吸收瓶形式,总采集效率可以达到94%以上。对纳米TiO2生产现场粉尘的控制研究表明,佩戴无纺布型口罩是非常有效的防护手段,单只口罩2.5 h平均截留效率大于86%,两只口罩2.5 h平均截留效率大于90%。根据口罩的拦截效果,参照NIOSH的推荐标准,建议将纳米TiO2生产现场的粉尘质量浓度定为小于1.0mg/m3。
Using sulfuric acid - ammonium sulfate mixed solution as absorption and digestion solution, the direct absorption, digestion and chromogenic analysis were developed for the production of nano-TiO2 in air. And studied the interception efficiency of various types of masks for nano-TiO2. The results showed that when the flow rate was 400 L / h and the collection time was 2.5 h, the two-stage absorption bottle was adopted, and the total collection efficiency could reach 94%. The research on the control of dust on the production site of nano-TiO2 shows that wearing a non-woven mask is a very effective means of protection. The 2.5 h average retention efficiency of a single mask is more than 86% and the average 2.5 h retention efficiency of two masks is more than 90%. According to the masking effect of the mask, referring to the recommended standard of NIOSH, it is suggested to set the concentration of dust on the nano-TiO2 production site to be less than 1.0mg / m3.